Learn how to launch the default app for a file. Many apps need to work with files that they can't handle themselves. For example, e-mail apps receive a variety of file types and need a way to launch these files in their default handlers. These steps show how to use the Windows.System.Launcher API to. Change default programs (file associations) to open Outlook attachments by Open with feature If you can find out the same type of files (the CSV file in my example) in your Computer, please follow below steps to change the default programs or file associations about opening specified type of Outlook attachments.
Each document that you have on your Mac is associated with a default application which macOS uses to open the file whenever you double-click on its icon in Finder. Sometimes you may have a legitimate reason for changing which app your Mac automatically launches when you open a common file type – when a newly installed app assumes control of it, or when you want to open AVI video files in VLC instead of QuickTime, for instance. The following steps show you how to do just that.
- In a Finder window, right-click (or Ctrl-click) the file whose default launch app you want to change.
- From the contextual menu, select Open With -> Other....
- A new navigation window will appear for you to select an alternative app to open the selected file. In our example, we're selecting the VLC media player app.
- Tick the checkbox next to Always Open With to ensure your selection applies in future to all files with the same extension (AVI files, in our case). If you don't see the checkbox, click the Options button at the lower left of the window and it should appear.
- Click Open.
There's another way you can change a file type's associated app in macOS: Right-click (or Ctrl-click) on the file in a Finder window and select Get Info.
In the information dialog that appears, you should see the Open with: section immediately below the Comments: section (click the chevron buttons to expand individual sections). Select Other... in the drop-down menu of apps to select one not already in the list, and then click Change All... to apply the association to all files with the same extension.
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Change Default Program For Extension
File extensions are vital because they tell your computer what programs can open a file. Normally, you don’t have to do much with them in Windows aside from setting your default programsHow to Change Default Apps and Settings in Windows 10How to Change Default Apps and Settings in Windows 10Here's how to change default programs in Windows 10 if you're not happy with how the OS behaves out of the box.Read More.
However, sometimes you’ll find that a file extension doesn’t open in the right program. Or maybe you want to double-check what app is set as default for a certain type of file. Here’s a quick guide to managing and resetting file associations in Windows 10.
How to Check/Reset File Associations in Windows 10
- Open the Settings panel, using Win + I as a keyboard shortcut if you like.
- Select the Apps entry, and choose Default apps on the left sidebar.
- Here, you’ll see the apps you have set as default for common tasks like emailing, listening to music, and more. Click one to change it.
- To look over the complete list of file associations, scroll down a bit and click Choose default apps by file type. This will let open a huge list of file extensions, many of which you’ve probably never heard ofHow To Open Strange File Types In WindowsHow To Open Strange File Types In WindowsComputers know thousands of different file formats. Sometimes, both you and Windows are clueless as to how to open a strange file. Here is how you can figure out how to open those files.Read More. You can select any entry to change its associated program.
- The Choose default apps by protocol menu lets you select apps to handle certain URL protocols, like Mailto and FTP. In most cases, these change when you adjust default apps, so you shouldn’t have to make many changes.
- If you choose Set defaults by app, you’ll see all the types of files a certain app can open. This lets you easily change defaults when you notice a program opens when it shouldn’t, or vice-versa.
- Should you find that your file associations are completely messed up, you can click the Reset button to change everything back to the defaults. This includes Microsoft’s “recommendations”, so you’ll need to change your default browser back from Edge, as well as the other categories like photos, videos, and email.
For more, see our complete guide on fixing file type associationsHow to Quickly Fix Windows File Type AssociationsHow to Quickly Fix Windows File Type AssociationsSome tools have a bad habit of changing your default programs. They do that by changing file type associations. Windows 10 likes to mess with your preferences, too. Here's how to have it your way.Read More.